ExtensionBlock: A three-way GPIO extension board for the Raspberry Pi

Three-way What?

Did you ever want to use two add-on boards for the Raspberry Pi at the same time? That was not possible, because the boards were not stackable? Or use a fan and some add-on board? We might have a GPIO extension board that is just right for you then!

The ExtensionBlock is an add-on board for the Raspberry Pi and it is a three-way GPIO extension board for the 2×20 pin header.

You stack the ExtensionBlock on top of the existing 2×20 pin GPIO header. At its corners the board provides holes for spacers, locking posts, or other tightening setups.

The ExtensionBlock splits the original 2×20 pins of the Raspberry GPIO header to three 2×20 pin headers. The headers are located such that it allows you to stack two full-size HATs side-by-side onto the Raspberry Pi.

With two add-on boards attached to the ExtensionBlock you still have access to the third 3×20 pin GPIO header to

In addition to the pin headers for the HATs, the ExtensionBlock has a third 2×20 pin out so that you even have access to the GPIO pins when two HATs are installed.

This should give you a maximum of comfort during development and debugging of your project.

The ExtensionBlock also goes very well together with a fan and an additional add-on board.

Features of the GPIO Extension

Three-way GPIO extension for 2×20 GPIO pin header of the Raspberry Pi

First and second 2×20 pin out faced towards the original direction, while the third 2×20 pin out is faced in opposite direction.

Getting the ExtensionBlock

Can I use the ExtensionBlock with every Add-On Board?

The ExtensionBoard splits the original 2×20 pin header into three header pin outs. You can use every add-on board with the ExtensionBlock. However, if you attach two or more add-on boards to the ExtensionBlock you need to take care that the boards do not compete for the same pins.